Wideband antenna technologies are in growing interest for future radio telescopes, such as in 1-10 GHz SKA (the squire kilometer array) [1] and 2-13 GHz VLBI 2010 (VLBI=Very Long- Baseline Interferometry) [2] projects. The Eleven antenna, a new decade bandwidth log-periodic dual-dipole antenna developed at Chalmers University of technology, has very good features for applications in these radio telescopes due to the nearly constant- beamwidth with about 11 dBi directivity, the fixed phase center location over the- whole bandwidth, low profile, cryogenic cool-ability, high A/T values and simple geometry [3][4]. A dual polarized Eleven antenna is shown in Fig. 1.
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